diff --git includes/common.inc includes/common.inc
index e078d68..00e6b4a 100644
--- includes/common.inc
+++ includes/common.inc
@@ -4552,12 +4552,13 @@ function drupal_valid_token($token, $value = '', $skip_anonymous = FALSE) {
 }
 
 function _drupal_bootstrap_full() {
-  $called = &drupal_static(__FUNCTION__);
+  // Files can never be unloaded so we use a normal static.
+  static $called = FALSE;
 
   if ($called) {
     return;
   }
-  $called = 1;
+  $called = TRUE;
   require_once DRUPAL_ROOT . '/' . variable_get('path_inc', 'includes/path.inc');
   require_once DRUPAL_ROOT . '/includes/theme.inc';
   require_once DRUPAL_ROOT . '/includes/pager.inc';